An mTicket is a ticket contained within a mobile phone app that displays as a barcode.
It must be activated prior to use and is available to be purchased for most journeys through the TfW website and app.
An eTicket is an electronic ticket that includes a barcode sent as a PDF in an e-mail.
The eTicket can be saved to a mobile phone or printed out but is only valid for single use and only available on some TfW Advance tickets.